Chloroplast Genome Analysis of Two Medicinal spp. (Orchidaceae) Shed Light on the Genetic Information, Comparative Genomics, and Species Identification.

Although the medicinal properties of spp. have been previously studied, there is little genomic information providing a valuable tool for the plant taxonomy, conservation, and utilization of this genus. This study used the next-generation MiSeq sequencing platform to characterize the chloroplast (cp) genomes of and .

A Quantum Dot Fluorescence Sensor System Design for Hg²⁺ Trace Detection.

The detection of Hg²⁺ ions usually requires large laboratory equipment, which encounters difficulties for rapid field test in most applications. In this paper, we design a reflective sensor for trace Hg²⁺ analysis based on the fluorescent quenching of Quantum dots, which contains two major modules, i. e.

[Quantitative detection of ethyl paraoxon based on SERS and PCA-SLR].

In the present paper, the surface-enhanced Raman spectroscopy (SERS) was used to build the model for the quantitative detection of ethyl paraoxon by the principal component analysis and segmented linear regression (PCA-SLR). Firstly, SERS in 820-1630 cm(-1) of ethyl paraoxon solution were measured and the spectra in 820-1630 cm(-1)(complete range) and 845-875 cm(-1) (characteristic range) of ethyl paraoxon solution were preprocessed by standard normal transformation (SNV), multiplicative scatter correction (MSC), the absolute values of first derivative and the second derivative respectively. Additionally, the number of dimensions of the spectra was reduced by PCA.

[Design and development of trace Cr(VI) sensor].

Hexavalent chromium detection in medicine capsules is generally analyzed in the laboratory, it is difficult to meet the demand for field detection, and to address this problem, a sensor which can be used for on-site detection of trace amounts of hexavalent chromium was designed. It mainly includes chemically sensitive materials, optical sensing module and signal processing module, the chemical sensitive materials is to achieve the conversion of the hexavalent chromium concentration signal, the optical sensing module is to complete a stable output of the laser light source, and the signal processing module is to complete a photoelectric conversion of the weak fluorescence signal, signal amplification, and data processing and displaying. With using the indigenously developed photoelectric acquisition, conversion and signal processing system to complete the rapid detection of trace amounts of hexavalent chromium, so the miniaturization of testing instruments and on-site detection were achieved.

[The luminescence characters of heterocyclic selenium compounds and metallic ion in ethanol solutions].

We investigated the luminescence characters of the ethanol solutions containing metallic ions and heterocyclic selenium compounds with different molecular structures in this paper. Heterocyclic selenium compounds included piazselenole (PS), 4,5-benzopiazselenole (BP), 5-methyl-piazselenole (MP), and 4,4'-dipiazselenole (DP). The results were as follows: (1) When the conjugative effect of piazselenoles increased, the emission spectrum shifted to lower frequencies; (2) Sn(IV) made the DP emission wavelength shorten.

[The UV spectra of heterocyclic selenium compounds and metallic ions in ethanol solutions].

The UV spectra of heterocyclic selenium compounds and metallic ions in ethanol solutions were investigated in this paper. Heterocyclic selenium compounds included 4,5-benzopiazselenole (BP), anthra [1,2-c][1,2,5] selenadiazol-6,11-dione (AS), piazselenole (PS), 5-methyl-piazselenole (MP), 4,6-diBr-piazselenole (DBP) and 4,4-dipiazselenole (DP). Several important results were obtained: (1) The absorption wavelengthslambda of piazselenoles were bathochromic and their epsilon increased with the increased conjugative effect; (2) Sn(IV) enhanced the UV absorption of piazselenoles at higher frequencies with the ratio of nSn(IV)/nPS at 1; (3) The UV absorption of BP was obviously enhanced by Sn(IV), Cd(II), Cr(III), Sb(III), Fe(III), Fe(II) and Cu(II), while Zn(II) had little effect on the UV of BP; (4) The UV absorption of piazselenoles at higher frequencies was enhanced by Sn(IV), Cr(III) and Sb (III), and the peak of MP at 233 nm was blunt in MP-M solutions.